<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        body {
            padding: 100px;
        }
        
        textarea {
            width: 200px;
            height: 100px;
            border: 1px solid pink;
            outline: none;
            resize: none;
        }
        
        ul {
            margin-top: 50px;
        }
        
        li {
            width: 300px;
            padding: 5px;
            background-color: rgb(245, 209, 243);
            color: red;
            font-size: 14px;
            margin: 15px 0;
        }
        li a{
            float: right;
        }
    </style>
</head>

<body>
    <textarea name="" id=""></textarea>
    <button>发布</button>
    <ul></ul>
    <script>
        var btn = document.querySelector('button');
        var textarea = document.querySelector('textarea');
        var ul = document.querySelector('ul');

        btn.onclick = function(){
            if(textarea.value == ''){
                alert('未输入内容');
                return false;
            }else{
                var newli = document.createElement('li');
                newli.innerHTML = textarea.value + '<a href="javascript:;">删除</a>';
                ul.insertBefore(newli,ul.children[0]);
                textarea.value = '';
                var aa = document.querySelectorAll('a');
                for(var i = 0; i < aa.length; i++){
                    aa[i].onclick = function(){
                    ul.removeChild(this.parentNode);
                    }
                }
            }
        }
    </script>
</body>
</html>